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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Revenues $ 21,776 $ 18,540 $ 39,934 $ 34,940
Cost of revenues 8,709 7,417 15,726 14,112
Gross profit 13,067 11,123 24,208 20,828
Operating expenses        
Selling 2,288 1,342 4,087 3,405
General and administrative 6,782 4,005 11,519 7,841
Research and development 991 876 1,954 1,627
Total operating expenses 10,061 6,223 17,560 12,873
Operating income 3,006 4,900 6,648 7,955
Other expense, net 213 157 329 319
Earnings before income taxes 2,793 4,743 6,319 7,636
Income taxes 1,041 1,683 2,261 2,695
Net income $ 1,752 $ 3,060 $ 4,058 $ 4,941
Net income per share:        
Basic (in dollars per share) $ 0.49 $ 0.87 $ 1.13 $ 1.41
Diluted (in dollars per share) $ 0.47 $ 0.84 $ 1.09 $ 1.35
Weighted average common shares outstanding:        
Basic (in shares) 3,598 3,508 3,587 3,504
Diluted (in shares) 3,742 3,640 3,715 3,648